论文部分内容阅读
黑龙江省丰林森林自然保护区位于小兴安岭南坡,是珍贵的天然红松林分布中心。历年来,红松球果被害虫危害十分严重,特别是被红松球果螟(Dioryctriaabietella Schiff.)为害的被害率极高。据1972-1973两年初步调查,共查球果1,957个,被害果为1, 579个,被害率为80％。在一个球果中最多有虫33头,最少有一头,平均8.1头。每头幼虫一生平均为害种子3-5粒,最多达7粒,每一球果平均有115粒种子。球果被害有两种情况:一种是全部被害,一种是部分被害,未被害部分种子完好,这样大大降低了红松种子产量和质量,使更新所需种子供不应求。为了寻求对这一害虫有效而经济的防治措施,我们于1972—1973两年进行了初步观察,结果如下:
Fenglin Forest Nature Reserve in Heilongjiang Province is located in the southern slope of the Little Xing’an Mountains, is a precious natural distribution center of Korean pine forest. Over the years, pine cones have been seriously endangered by pests, especially those killed by the Dioryctria abietella Schiff. According to the preliminary survey conducted in 1972-1973, 1,957 balls were checked out, with 1 579 killed and 80% victimized. There are at most 33 worms in a conifer, at least one, with an average of 8.1 heads. Each larvae lasts an average of 3-5 seeds, up to 7 seeds, with an average of 115 seeds per cone. There are two cases of condemnation: one is all victims, one is partially killed, unharmed part of the seeds intact, thus greatly reducing the yield and quality of Korean pine seeds, so that the seeds needed for the update are in short supply. In order to seek effective and economical prevention and control measures for this pest, we conducted preliminary observations in 1972-1973 and the results are as follows: